Boss Audio MR60B 6.5” Speakers - (Pair) Black SKU# 397886.5” 2-Way Marine Speaker - Boss Marine Loudspeakers are designed to withstand the harsh conditions of the marine environment. All frame and grill sections are made of a polymer composite that is completely waterproof with a coating to protect against damage from UV rays. We use rubber surrounds and polypropylene cones to complete the waterproof package. The tinsel leads are coated to prevent corrosion. MFG #: MR60